Pump

Abstract

A pump having a simple and compact construction which permits leakage test of the pressure valve both outside and inside the pump housing, and, if necessary, ensures ease of replacement of individual parts, such as replacement of the pressure valve or the valve seat member, if leakage occurs during testing. The peripheral surface of the valve seat member facing the cover has a conical chamfer onto which an annular projection of the cover is movable into sealing abutment and is radially expandable to provide a press fit engagement.

We claim: 
     
       1. A pump, comprising: a pump housing including walls defining a pump cylinder, a pump piston guided in said pump cylinder,   a suction valve disposed in a compression chamber arranged in a supply line of the pump cylinder,   a pressure valve arranged at an outlet of the compression chamber, said outlet having a pressure fluid connection to a pressure fluid consumer,   a cover closing the pump cylinder,   wherein the pressure valve is interposed between said cover and a valve seat member in the pump housing,   wherein the valve seat member includes a conical chamfer into which an annular projection of the cover is moved into sealing abutment therewith and is radially expandable to provide a press fit engagement therewith.   
     
     
       2. Pump as claimed in claim 1, wherein the compression chamber has an expanded bore step that axially abuts and seals an end area of the valve seat member that is remote from the pressure valve. 
     
     
       3. Pump as claimed in claim 1, wherein the valve seat member is provided as a substantially disc-shaped pressure member adapted to be clamped between the bore step and the cover. 
     
     
       4. Pump as claimed in claim 1, wherein the radially expandable projection of the cover along with an expanded area of a bore step of the pump housing forms a wedge-type attachment. 
     
     
       5. Pump as claimed in claim 1, wherein the cover is retained in the pump housing by. 
     
     
       6. Pump as claimed in claim 1, wherein the peripheral surface of the valve seat member has an undercut to permit the material of the pump housing to be deformed.